I know there is a lot of questions about this but I really don\'t know where is my mistake.
My service is registered in the AndroidManifest.xml file
The API says:
typically comes from IntentSender.getBroadcast().
that means PendingIntent.getService can work too.
I tested it, and it works.
Look closely at the AlarmManager API and the PendingIntent. The AlarmManager.set() API is expecting a broadcast intent, which you are providing. However, you're trying to send a broadcast intent to a service, which cannot be done. Just create a BroadcastReceiver to catch the Intent and your BR should then start your service.
As in documentation, PendingIntent.getBroadcast() is used to retrieve a PendingIntent that will perform a broadcast, like calling Context.sendBroadcast().
You need to call PendingIntent.getService() instead, which will start IntentService:
PendingIntent pending = PendingIntent.getService(this, 0, alarmIntent, 0);